automatic winding, save time and labor, improve work efficiency. (Note: Try to avoid operating under direct sunlight, infrared light may cause the sensor motor to stop) Fits most spools, including M, L, 15 (universal) or any spool with a 1/4 inch (0.64 cm) center hole The bobbin winder is equipped with a start/stop button and indicator light, automatically stops winding when the yarn is full, easy to use Made of metal material, sturdy and , suitable for domestic or industrial sewing machines With metal fixing base plate, easy to install in minutes, can be placed anywhere you want Description: Our automatic bobbin winder is made of metal and is rugged enough to fit most bobbins, including M, L, 15 (universal) or any bobbin with a 1/4 inch (0.64 cm) center hole SAVE TIME: Automatically winds the bobbin, saves time and effort and improves work efficiency. (Note: Avoid operating in direct sunlight, infrared light may cause the sensor motor to stop) EASY TO USE: The bobbin winder is